Blast holes



(No Model.)

L. PLOM 8; J. DANDRIMONT.

REAMER FOR FORMING BLAST HOLES.

Patented Mar. 5, 1889.

u. PETERS. PhMo-Liihngnpher. wmanm. a: a

UNITED STATES PATENT thrice,

IQEOIO'LD ILOM, OI RE'IIXNE, AND JULIE)? ITANDRIMOX'F, OF LIEGE,BELGIUBI.

REAMER FOR FORMING BLAST-HOLES.

SPECIFICATION forming part of Letters Patent No. 399,156, dated March 5,1889.

Application filed October 31, 1888. Serial No. 289,588.

(No model.) Patented in Belgium December 23, 1886, No. 5,616; i

France January 3,1887, No. 167,827; in Luxemlmrg January 8, 1887, No.783, and in England January 4, 1887, No. 129.

T 0 all whom it may concern:

Be it known that we, LEOPOLD PLOM, of Retinne, and J ULIEN DANDRIMONT,of Liege, Belgium, subjects of the King of Belgium, have inventedcertain new and useful Improvements in Reamers for Forming Blast-Holes,(the same having been patented in the following countries, to wit: InBelgium December 23, 1880, No. 5,616; in France January 1887, No.167,827; in Great Britain January l, 1887, No. 129, and in LuxenihurgJanuary 3, 1887, No. 783,) of which the following is a specifier," tion.

Our invention is a device for blasting coal and other minerals; and itrelates to devices employed in the mode of blasting where an 1 innerenlarged cavity is formed connnunicating with an ordinary borehole forthe purpose of breaking away a greater amount of the mineral at a singleoperation, as fully described in our copending application, Serial No.925,495, filed January 25, 1887. It will he tnnlcrstood upon referenceto said application that the bore-hole is extended a distance beyond theenlarged cavity and a plug then inserted in such a manner that the forceof same with reference to the accompanying drawings, and thenparticularly point out the novel features in the claims.

In said drawings, Figure I is an axial section of the preferred form ofour device, showing the arms or wings extended. Fig. II is a similarview of the lower end of the device, showing the arms or wings folded.Fig. III is a section taken through. a strata of the mineral to beoperated upon, showing the borehole, enlarged cavity, plug, fuse, andtamping in position, as fully dcscrihcd in our hereinhct'orea-eterrcd toapplication.

'0 will state here that we do not claim the method (shown in Fig. III)of blasting, lml,

longitudinally to drive the same from its po- 5 sition.

ll'ith the above ends in view our invention consists in jiroviding asuitable tube having iliamctriwilly-opposite slots, with a stem havingpivoted to its ends two serrated or other boring arms or wings, soshaped that when the stem is inserted in the tube a sufficient distanceand then withdrawn slightly the wings will engage the forwardextremities of the slots and he forced outward transversely to the tube,when the tube may he rotated to cut away the desired cavity, the wingsbeing continually extended laterally by the c0ntinned movement of thestem. Forward of the cutting-wings the stem may he formed into a helicalscrew for engaging and discharging forwardly the dust or material cutaway in the cavity, Just above the surface suitable apertures or slotsmay he formed in the tube to permitthe escape of the finelyhavc claimedthe sumo in the prior application.

A represents the arms or wings, pivoted on the stem C and havingserrations u, said arms and stem being inserted in the tube D. The stem0 has the helical conveyor D, for the purpose of forwarding thegranulated or pulverized material. 3 {I/ are slots, respectively, forthe spreading of the arms and the outletof material.

F is a sleeve keyed at i i to the tube I) in such a manner that it in herotated thereon without moving longitudinally. This sleeve D hasscrew-threads f, in which engage corresponding threads, I, on the headI, of the stem. This stem C may have a square head, 0, for the receptionof a hand wheel or crank, X, for turning the stem with its wings, and,by means of the engagement of the latter with the sides of the slots,the tube.

In practice a hole, H, ishored into the mineral to lie blasted, the tuheD, with the stem and wings in the position shown in Fig. II, theninserted to the proper depth, a crank applied to the end 0 for rotatingthe stem, and, by means of the wings, the tube with it, the

sleeve F slowly rotated to move the stem, C.

outward, whereby the wings A will be gradually extended, the rotation ofthe whole being constantly kept up and the cavity M thereby formed.Vhile this operation is going 011 the minute particles will enterthrough the slots 8, gradually work upward until they reach the conveyerB, when they will be forwarded to the slots g outside of the bore-holeand be deposited upon the ground. T0 withdraw the instrument, therotation of the sleeve F is reversed until the head L reaches the innerend of the sleeve, when the wings will be found to have reached thefolded position and the tube may be easily withdrawn.

This device, it will be seen, is a ready and effective instrument forperforming the work hereinbefore described, but it may be varied inminor details. The manner in which the sleeve F is keyed to the tube Dmay be varied at will; also the means for rotating the whole instrumentin the hole, and the sleeve F may be provided with suitable meanswhereby it may be more readily rotated upon the tube.

It will be noticed that the tube is provided with two pairs of slots,through either one of which the wings may be extended. Of course we donot limit ourselves to four slots, or any number, for, if desirable,three or even more pairs may be used; or, if necessary for the sake ofstrength, one pair only may be used.

As hereinliiefore stated, we do not claim in this application the methodof blasting, but simply the instrument, hereinbefore decribed, wherebythe inner cavity may be produced.

Having thus fully described our invention and the manner in which thesame is to be operated, the following is what we claim as new thereinand desire to secure by Letters Patent:

1. In an. instrument for forming blast-holes in coal or other mineral,the combination, with an inclosing-tube and a drill-rod having anextensible end folding within said rod, of a sleeve screwing on one endof the above members and secured to the other, so as to rotate thereon,whereby the latter ,may be withdrawn substantially in the mannerexplained.

2. In an instrument for forming blast-holes, the combination, with thetube D, having apertures s, of a red, C, located within said openendedtube and having the wings A pivoted to it, said Wings being inclinedoutward, whereby they engage in the apertures when moved in onedirection and fold upon the rod, and are brought entirely within thetube when moved in the other direction, substantially as hereinexplained.

3. In an instrument for forming blast-holes, substantially as described,the combination, with the tube D, having apertures g, of the rod C,carried by the tube and having a cutting end, and a spiral portion, B,for conveying the pulverized material from the cutting end anddischarging it through the apertures g, substantially in the mannerexplained.

4c. In an instrument for forming blast-holes, substantially asdescribed, the combination, with the tube D, having sleeve F, keyed by alug and annular slot thereon, of a rod, 0, having wings A bent outwardin opposite directions, whereby they engage an edge on the tube and ahead, L, said sleeve and head having corresponding screw-threads,whereby upon rotation of the sleeve the rod is moved relatively to thetube D and the wings A extended, as

fully explained.

5. In an instrument for forming blast-holes, substantially as described,the combination, with the tube D, stem C, and wings A, mounted on thestem, said tube having the apertures s g, and the sleeve F, keyedthereon so as to be rotatable, of a rod having the conveycr B and head Land crank X, said head and sleeve F being correspondinglyscrew-threaded, whereby they engage, and upon rotation of the sleeve therod is moved relatively to the tube to extend the wings and convey thefine material to discharge it through the apertures the whole instrumentbeing rotated substantially in the manner herein set forth.

LEOPOLD PLOM. J U LIEN DANDRIMONT.

In presence of- WM. S. PRESTON, M. DE MATHELIN.

torrection in Letters Patent No. 399,156.

I It is hereof certified that in Letters Patent No. 399 156 fifi ceefiQWW the application of Leopold Plom, of Retinne, and Jnlien DAndrilnont, of Liege, France for an improvement in Reamers for FormingBlast-Hows, an error appears in the printed specification requiringcorrection, as follows: In lines 564, page 2 the compound wordopen-ended should be stricken out and. inserted in line 55, same page,

- before the word tube and that the Letters Patent should. be read withthis correction therein that the same may conform to the record of thecase in the Patent Ofliee.

12th day of Mar h, A. D. 1889.

I). L. HAWKINS,

Signed, countersigned, and sealed this [SEAL] A istant Secretary of theInterior.

Oountersigned:

BENTON J. HALL,

Commissioner of Patents.

